What Is A Watermark And For What Purpose is it used ?

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What is a Watermark and for what purpose is it used ?

If you hold a sheet of paper up to the light you can usually see a mark. Which has been worked in during the process of manufacture

This is thewatermark,the manufacturer's mark  to distinguish the different brands of paper. On banknotes is serves the useful purpose of preventing forgery. In many case it used to mark postage stamps,and stamp collector study these markings.